@font-face{font-family:Space;src:url('/assets/fonts/spacegrotesk.ttf') format('truetype');font-weight:300 700;font-display:swap}
:root{color-scheme:light;--bg:#fafaf7;--ink:#252821;--muted:#565b50;--surface:#fff;--line:#858c7d;--accent:#ffd052;--on-accent:#252821;--tint:#f1f2eb;--error:#ad2424;--focus:#805000;--space:clamp(20px,4vw,56px)}:root[data-theme=dark]{color-scheme:dark;--bg:#20221e;--ink:#f5f6ef;--muted:#bcc4b6;--surface:#282d25;--line:#7f8b74;--accent:#ffd052;--on-accent:#252821;--tint:#30382a;--error:#ffaca7;--focus:#ffd052}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 system-ui,sans-serif;scrollbar-color:var(--line) var(--bg)}::selection{background:var(--accent);color:var(--on-accent)}a{color:inherit;text-underline-offset:.22em}a:hover{text-decoration-thickness:2px}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{min-height:44px;border:1px solid var(--line);border-radius:4px;padding:9px 15px;background:var(--surface);color:var(--ink);cursor:pointer}button:hover{border-color:var(--ink);background:var(--tint)}button:disabled{opacity:.55;cursor:default}:focus-visible{outline:3px solid var(--focus);outline-offset:4px}input,select{width:100%;min-width:0;min-height:50px;border:1px solid var(--line);border-radius:4px;padding:10px;background:var(--surface);color:var(--ink);caret-color:var(--focus);font-variant-numeric:tabular-nums}input[aria-invalid=true]{border:2px solid var(--error)}label{display:grid;gap:7px;font-weight:600}h1,h2,h3,.brand,output{font-family:Space,system-ui,sans-serif}h1{font-size:clamp(2.25rem,4.8vw,4.2rem);line-height:1.08;letter-spacing:-.035em;max-width:17ch;text-wrap:balance;margin:0 0 20px}h2{font-size:clamp(1.7rem,3vw,2.4rem);line-height:1.2;letter-spacing:-.02em}h3{font-size:1.25rem;margin:34px 0 8px}p{margin:0 0 18px}p,li{overflow-wrap:break-word}.skip{position:absolute;left:16px;top:-100px;background:var(--accent);padding:10px;z-index:9}.skip:focus{top:12px}.site-header,.tool-nav,main,.site-footer{max-width:1200px;margin:auto;padding-left:var(--space);padding-right:var(--space)}.site-header{padding-top:24px;padding-bottom:24px;display:flex;justify-content:space-between;gap:24px;align-items:center}.brand{font-size:22px;font-weight:700;display:flex;gap:10px;align-items:center;text-decoration:none;line-height:1.15}.brand svg{width:32px;height:32px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:2}#theme-toggle{font-size:14px;background:transparent}.tool-nav{display:flex;gap:6px 24px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:14px}.tool-nav a{text-decoration:none;padding:8px 0;font-size:15px}.tool-nav a[aria-current]{font-weight:700;box-shadow:0 3px var(--ink)}main{padding-top:clamp(30px,5vw,62px)}.intro{margin-bottom:34px}.intro>p{color:var(--muted);max-width:60ch}.workbench{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);border-top:2px solid var(--ink);border-bottom:1px solid var(--line);margin-bottom:65px}form{padding:32px 32px 32px 0;display:grid;gap:22px;align-content:start}.time-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px}.check{display:flex;align-items:center;gap:10px;font-weight:400}.check input{width:21px;min-height:21px;accent-color:var(--ink)}#break{max-width:190px}.hint{font-size:14px;color:var(--muted);margin:0}.primary{background:var(--ink);color:var(--bg);border-color:var(--ink);font-weight:650;justify-self:start;padding:12px 24px}.primary:hover{background:var(--accent);color:var(--on-accent)}.result-panel{padding:32px;background:var(--accent);color:var(--on-accent);align-self:stretch}.result-caption{font-size:16px;margin-bottom:14px}output{display:block;font-size:clamp(2.3rem,4vw,3.7rem);line-height:1.12;font-weight:600;letter-spacing:-.035em;font-variant-numeric:tabular-nums;margin-bottom:24px;overflow-wrap:break-word}.result-panel p{max-width:45ch}.result-panel .secondary{background:transparent;color:var(--on-accent);border-color:var(--on-accent)}.result-panel :focus-visible{outline-color:var(--on-accent)}#status{font-size:14px;margin:12px 0 0;min-height:1.5em}.error{color:var(--error);font-weight:600;font-size:15px;margin:0}.notice{padding:20px;border:1px solid var(--line)}#time-line{display:block;width:100%;margin:10px 0 24px}#time-line text{fill:currentColor;font:20px Space}#time-line .axis{stroke:currentColor;stroke-width:2}#span-line{stroke:currentColor;stroke-width:10;transition:d .25s cubic-bezier(.16,1,.3,1)}.time-row{display:grid;grid-template-columns:1fr 1fr auto;gap:12px;align-items:end;margin-bottom:16px}.time-row label{font-size:14px}.remove{font-size:14px}.explain,.article{max-width:73ch;margin:0 auto 70px}.explain>h2,.article h2{margin:44px 0 18px}.article>h1{max-width:20ch}.article p{margin-bottom:20px}.contact-email{font-size:clamp(1.1rem,3vw,1.6rem);overflow-wrap:anywhere}table{width:100%;border-collapse:collapse;margin:28px 0;font-size:15px}caption{text-align:left;font-weight:600;margin-bottom:10px}th,td{text-align:left;padding:12px 8px;border-bottom:1px solid var(--line)}th{background:var(--tint)}.site-footer{border-top:1px solid var(--line);padding-top:28px;padding-bottom:32px;font-size:14px;color:var(--muted);display:flex;gap:20px;justify-content:space-between}.site-footer nav{display:flex;gap:16px;flex-wrap:wrap}.site-footer p{margin:0} [hidden]{display:none!important}
@media(max-width:750px){.site-header{gap:12px;align-items:flex-start}.brand{font-size:19px;max-width:170px}#theme-toggle{max-width:140px;font-size:13px;padding:7px}.tool-nav{gap:4px 20px}.workbench{grid-template-columns:1fr}.intro{margin-bottom:26px}form{padding:26px 0}.result-panel{padding:24px;margin-bottom:0}.time-pair{gap:12px}.site-footer{display:block}.site-footer p{margin-bottom:18px}.explain{margin-bottom:40px}}
@media(max-width:360px){.time-pair{grid-template-columns:1fr}.time-row{gap:8px}.remove{padding:8px}.tool-nav a{font-size:14px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}